Improved extension-ladder



T. F. 'MANTEY, OF NEW ORLEANS, LOISIA'NA.

Leners Patent No. 78,302, am@ tray 2e, 186s. n"

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T0 ALL WHOM I'l MAY CONOlilRN:Y

Be it known that I, TfF. MANTEY, of New Orleans, in the parish of Orleaps, and State of Louisiana, have invented new and useful Improvements in Extension-Ladders and I do hereby declare that the following is a. full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference 1rieing'had to the accompanying drawings, forming:r part of tlis'speciiication, in Which- Figure l is a plan View of thc actuatingfmechanism of the ladder. v

Figure 2 is aside elevation of the ladder and wagon bearing it.

Similar letters of reference indicate corresponding parts.

This invention refers to a. ladder for a lire-escape and other uses.

It consists of a chair, elevated by a system of pivoted lattice-bars, in combination with the elevating and adjusting-mechanism, with certain improvements perfecting the whole, `as will hereinafterbe more fully set forth.

In the drawings, the pivoted extension-lattice is shown at A.

These are constructed upon the principle familial-ly known as lazy-tongs.

The chair, B, is attached by a curved slotted plate, L, as shown, the pivot 'L' traversing in the slot g, when the ladder is raised or lowered, by which action the chair is held horizontally.

When the lower bars, C, are drawn together', the lattice-bars composing the whole system are likewise drawn more vertical, which accomplishes the elevation ci' the chair B, as will be obvious.

H is a cranlr, for turning the screw G, which accomplishes the drawing in or pushing out of the bars C, for 4 the said screw works in hollow screws in the cross-bars E, as shown.'

The lower bars C are mounted on a. stout bar, N, having bearings P in the stout standards D, as shown.

These standards 'rise from a cross-plate, Q, which has u. central hole, by which it is hung on the central pintle-base R,rising from the centre oi-` the bed-plate S, resting on and bolted to the carriage-frame'ltlnev' "d latter being mounted on the wheels U, whichveonsti-tute the means of transportation of the apparatus.

The axle-trees arebent, so as to bring the. bed-plate and actuating-mechanism near the ground, for the purpose of conferring stability upon the whole machine.

The extension g of the cross-plate Q, is furnished with a. pin, r, which hears upon the bed-plate S, as shown, thus relieving the pintle from any strain, and providing a i'iriner base for the superstructure. l

A tongue, M, extendingr from the cross-plate Q, and `forming part of the same, serves to turn the ladder upon the pintle-basc R, and to steady the same, if requisite, the pin 'i' bearing upon the plate S, when theladder is turned upon the pintle-bnse or held steadily in one position.

Two bars, k, projecting from the cross-plate Q,are connected with the standards D by a brace-rod, e, as shown, 'or the purpose oi' strengthening the standards D. v

Anchoringvbars, K, are pivoted to thefraines T, andare provided at their outer endwith a cianlrscre\v, J, for the purpose of holding thewhole apparatus irrnly, when the saine is located'at any point for use.

Chains or cords, b, attached to the lon'er extremities of the bars C, es shown, are wound up on Winches e v.

'.lhese'winches are placed justA above the cross-plate Q, and have bearings in projecting arms attached 'to the said cross-plate, as shown. i

These Winches are turned by handles h.

The purpose of. this lest-described attachment is to adjust the ladder at any desired angle from the perpendicular, or to bring the same to a vertical position, which can be accomplished by turning the handles 7L in the proper corresponding directions. 'i

In operating this ladder, it is drawn to the desired locality, and firmly secured to the ground by the arm K and cranlbscrew J, before described. i

The crank, Il, is then turned, and the chair elevated. l

The proper angle of deflection is obtained by winding the' chain Z) on one winch, and unwinding it from the other.

By means of the tongueM `the ladder is turned on its pintl'e, so as to bring the chair inthe proper position.

Pawls, m, catch into the teeth of the ratchet-wheels n of.' the Winches, and hold-the same at any desired angle.

This machine can thus be employed as o. fire-escape, or as o ladder for any common purpose, or it will be found nseiul for military reconnoissonee.

In practice it is composed of iron, and the sections of the extension-lattice are pivoted by bolts and nuts, in the manner shown, the central pivot-bolts extending across and connecting the two sides of the extensionlattice.

I The bars ofthe lattice project beyond the pivots, as shown et w.

Their extremities, u, ore 'bent to form o stop, which comes in contact with the adjzieent bei', when the ladder is fully extended, whereby the lofttiee-bnrs are held more rmly.

This invention isfeimple and durable, and will be found in practice to fully accomplish the object for which it is intended. l y

vI claim ns new, and desire to secure by Letters Potentm 1. The Winches o, in combination with the extensiondattice A. and chins b, for the piirpose of adjusting the lattice, when elevated by the screw G, at any desired' angle, as herein shown and described. f y

2. The crank-screw J :1nd bur K, in combination with the frame 'l and ex'tensiondattice A, :illI substantially as and for the pnrpose shown and described.

3. The combination of the pintlebase R, extension-lattice A, adjustable plate Q, having the projection q, bearing the pin 1' and tongueA M, ail arranged and operntintr :is described for the purpose specified.

T, n'MANTEY.

Witnesses:

WM. H. REYNOLDS, G-Eo. A. It. BAUii.. 

